Idly, the detective thought what his next move should be.
Had we but world enough and time / This coyness, lady, were no crime. / We would sit down, and think which way / To walk, and pass our long love's day.c. 1650, Andrew Marvell, To His Coy Mistress
2
To have (some statement) in one's mind; to say to oneself mentally.
"I should phone my mother," I thought.
So this was my future home, I thought! Certainly it made a brave picture. I had seen similar ones fired-in on many a Heidelberg stein. Backed by towering hills,[…]a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams.1908, W[illiam] B[lair] M[orton] Ferguson, chapter IV, in Zollenstein, New York, N.Y.: D. Appleton & Company, →OCLC:
3
To communicate to oneself in one's mind, to try to find a solution to a problem.
I thought for three hours about the problem and still couldn’t find the solution.
Thinks I to myself, “Sol, you're run off your course again. This is a rich man's summer ‘cottage’ and if you don't look out there's likely to be some nice, lively dog taking an interest in your underpinning.”1913, Joseph C[rosby] Lincoln, chapter I, in Mr. Pratt’s Patients, New York, N.Y.; London: D[aniel] Appleton and Company, →OCLC:
4
To conceive of something or someone
I tend to think of her as rather ugly.
Think of banking today and the image is of grey-suited men in towering skyscrapers. Its future, however, is being shaped in converted warehouses and funky offices in San Francisco, New York and London, where bright young things in jeans and T-shirts huddle around laptops, sipping lattes or munching on free food.2013 August 3, “Revenge of the nerds”, in The Economist, volume 408, number 8847:
5
To be of the opinion (that); to consider, judge, regard, or look upon (something) as.
I don't think it worth complaining about the leak in the roof, is it?
I hope you won’t think me stupid if I ask you what that means.
4 more examples
She thought it pointless starting before four o'clock.
I think she is pretty, contrary to most people.
Boxing is thought to be a dangerous sport.
It was thought that I was the mole in the company.
6
To guess; to reckon; to believe while admittedly being uncertain.
We should/would have thought she could've washed her hands before, at least.
7
To plan; to be considering; to be of a mind (to do something).
The cupbearer shrugged up his shoulders in displeasure. "I thought to have lodged him in the solere chamber," said he[…]1819 December 20 (indicated as 1820), Walter Scott, Ivanhoe; a Romance. […], volume (please specify |volume=I to III), Edinburgh: […] Archibald Constable and Co.; London: Hurst, Robinson, and Co. […], →OCLC:
“Well,” I answered, at first with uncertainty, then with inspiration, “he would do splendidly to lead your cotillon, if you think of having one.” ¶ “So you do not dance, Mr. Crocker?” ¶ I was somewhat set back by her perspicuity.1897 December (indicated as 1898), Winston Churchill, chapter IV, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd., →OCLC:
1 more example
In 1985 I sat down and wrote a four-page outline from which I thought to base such a work.1998, Dovid Rossoff, Where Heaven Touches Earth, page iii:
8
To presume; to venture.
Think not to say within yourselves, We have Abraham to our father.1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Matthew 3:9:
9
Abbreviation, Ellipsis, Informal Ellipsis of think so.
Etymology From Middle English thinken, thynken, thenken (also thinchen, thünchen), from Old English þyncan (“to seem, appear”), from Proto-Germanic *þunkijaną (“to seem”). Cognate with Dutch dunken (“to seem, appear”), German dünken (“to seem, appear”), Danish tykkes (“to seem”), Swedish tycka (“to seem, think, regard”), Icelandic þykja (“to be regarded, be considered, seem”). More at methinks.
1
To seem, to appear.
Obsolete except in methinks
And whanne syr launcelot sawe he myghte not ryde vp in to the montayne he there alyghte vnder an Appel tree […] And then he leid hym doune to slepe And thenne hym thoughte there came an old man afore hym the whiche sayd A launcelot of euylle feythe and poure byleue wherfor is thy wille tourned soo lyghtely toward thy dedely synne1485, Sir Thomas Malory, chapter V, in Le Morte Darthur, book XV: